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Front driveshaft angle and length

M

MXGREEN

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Location
Texas
1986 K5 with a LS swap 6L80 NP208
Front driveshaft shaft with Cardan joint on TC side
Trying to measure length and angles?
Currently TC angle is 5deg up and front 5deg up (10deg) difference.
Measured length is 31in
Driveshaft 31in fully compressed slip yolk.

Suggestions and advice…..
 
Length is one thing, and needed travel is a different game.
Typically it's best to cycle the suspension and measure to 100% compression and droop, then add a buffer distance

Not completely clear what you mean by 10* up on the case. These trucks stock, the rear output is 5* lower than the truck at level

Also, the Tom Woods website is great for measuring and understanding the angles
 
Do you have the t case shimmed down in front?

Take that drive shaft out, if you compress the front suspension, you could break the the t case adapter or the the trans tail mounting area.

Tom woods( Blaze Bash sponsor) or Denny's Drive shaft, will have a form for all measurements, and how to measure.
 
Wes Harden said:
Do you have the t case shimmed down in front?

Take that drive shaft out, if you compress the front suspension, you could break the the t case adapter or the the trans tail mounting area.

Tom woods( Blaze Bash sponsor) or Denny's Drive shaft, will have a form for all measurements, and how to measure.
Click to expand...
haha, what /\ said...
 
The drivetrain is shimmed down at the transmission to clear transmission tunnel.
The front TC angle is 5deg up from 0deg level and front angle it 5deg up from 0deg level as well.

I’ll check out those other sights as well.

Thanks.
 
MXGREEN said:
The drivetrain is shimmed down at the transmission to clear transmission tunnel.
The front TC angle is 5deg up from 0deg level and front angle it 5deg up from 0deg level as well.

I’ll check out those other sights as well.

Thanks.
Click to expand...
Front axle CV angle is 5deg above 0deg level
 
What trans, I normally recommend taking the shims out.
This trans tunnel clearance issue is new to me.
 
Sorry…. It is an LS swap with a 6l80 transmission. So the stock geometry is out the window. I had a custom rear driveshaft built and now trying to connect the front.
I have the stock double cardan driveshaft I’m trying to retro fit. The TC output shaft is pointing up 5deg and the the front axle is pointing up 5deg. The measured length from TC to front axle is 31inches when the blazer is on the ground.
 
Is the back output shaft lowered to make a better angle on the rear end??
 
yeah being the front drive shaft you could possibly get away with those angles since you won't be doing hwy speeds and only when you wheel.
The CV type does want the axle pinion pointed at the t case out put.

When I did my rear cv style drive shaft I didn't worry about the t case side only the pinion side. My drive shaft and pinion are with 1/2° of each other. I measured the pinion angle at the pinion w/o drive shaft, then installed drive shaft and measured the sloop angle of shaft.

I use this tool https://smile.amazon.com/gp/product/B07ZWW3BW5/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&th=1
 
You would be be better off reworking the tunnel. Even in stock height it is a bad angle in the front, lowering the TC just makes it worse.
 
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